What are the two possible solutions to 5x^2−15=0?

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?